![Dictionary - Create
# Creating an empty Dictionary
Dict = {}
# Creating a Dictionary with Integer Keys
Dict = {1: 'Zooming', 2: 'For', 3: 'Zooming’}
# Creating a Dictionary with Mixed keys
Dict = {'Name': 'Zooming', 1: [1, 2, 3, 4]}
# Creating a Dictionary with dict() method
Dict = dict({1: 'Zooming', 2: 'For', 3:'Zooming’})
# Creating a Dictionary with each item as a Pair
Dict = dict([(1, 'Zooming'), (2, 'For')])](https://image.slidesharecdn.com/6-191007101805/85/Python-Dictionary-3-320.jpg)
![Dictionary – Adding element
# Creating an empty Dictionary
Dict = {}
# Adding elements one at a time
Dict[0] = 'Zooming'
Dict[2] = 'For'
Dict[3] = 1
# Adding set of values
# to a single Key
Dict['Value_set'] = 2, 3, 4
# Updating existing Key's Value
Dict[2] = 'Welcome’
# Adding Nested Key value to Dictionary
Dict[5] = {'Nested' :{'1' : 'Life', '2' : 'Zooming’}}](https://image.slidesharecdn.com/6-191007101805/85/Python-Dictionary-4-320.jpg)
![Dictionary – Accessing element
# Creating a Dictionary
Dict = {1: 'Zooming', 'name': 'For', 3: 'Zooming'}
# accessing a element using key
print("Acessing a element using key:")
print(Dict['name'])
# accessing a element using key
print("Acessing a element using key:")
print(Dict[1])
# accessing a element using get()
# method
print("Acessing a element using get:")
print(Dict.get(3))](https://image.slidesharecdn.com/6-191007101805/85/Python-Dictionary-5-320.jpg)
![Dictionary – Removing element
Dict = { 5 : 'Welcome', 6 : 'To', 7 : 'Geeks’,
'A' : {1 : 'Geeks', 2 : 'For', 3 : 'Geeks'},
'B' : {1 : 'Geeks', 2 : 'Life'}}
print("Initial Dictionary: ")
print(Dict)
# Deleting a Key value
del Dict[6]
# Deleting a Key from Nested Dictionary
del Dict['A'][2]
# Deleting a Key using pop()
Dict.pop(5)
# Deleting entire Dictionary
Dict.clear()](https://image.slidesharecdn.com/6-191007101805/85/Python-Dictionary-6-320.jpg)
![METHODS DESCRIPTION
copy() They copy() method returns a shallow copy of the dictionary.
clear() The clear() method removes all items from the dictionary.
pop() Removes and returns an element from a dictionary having the given key.
popitem() Removes the arbitrary key-value pair from the dictionary and returns it as tuple.
get() It is a conventional method to access a value for a key.
dictionary_name.values() returns a list of all the values available in a given dictionary.
str() Produces a printable string representation of a dictionary.
update() Adds dictionary dict2’s key-values pairs to dict
setdefault() Set dict[key]=default if key is not already in dict
keys() Returns list of dictionary dict’s keys
items() Returns a list of dict’s (key, value) tuple pairs
has_key() Returns true if key in dictionary dict, false otherwise
fromkeys() Create a new dictionary with keys from seq and values set to value.
type() Returns the type of the passed variable.
cmp() Compares elements of both dict.](https://image.slidesharecdn.com/6-191007101805/85/Python-Dictionary-7-320.jpg)
Python Dictionary
- 2. Dictionary • It is an unordered collection of data values, used to store data values like a map. • Dictionary holds key:value pair. • Key value is provided in the dictionary to make it more optimized. • Each key-value pair in a Dictionary is separated by a colon :, • whereas each key is separated by a ‘comma’. • Key – must be unique and immutable datatype. • Value – can be repeated with any datatype..
- 3. Dictionary - Create # Creating an empty Dictionary Dict = {} # Creating a Dictionary with Integer Keys Dict = {1: 'Zooming', 2: 'For', 3: 'Zooming’} # Creating a Dictionary with Mixed keys Dict = {'Name': 'Zooming', 1: [1, 2, 3, 4]} # Creating a Dictionary with dict() method Dict = dict({1: 'Zooming', 2: 'For', 3:'Zooming’}) # Creating a Dictionary with each item as a Pair Dict = dict([(1, 'Zooming'), (2, 'For')])
- 4. Dictionary – Adding element # Creating an empty Dictionary Dict = {} # Adding elements one at a time Dict[0] = 'Zooming' Dict[2] = 'For' Dict[3] = 1 # Adding set of values # to a single Key Dict['Value_set'] = 2, 3, 4 # Updating existing Key's Value Dict[2] = 'Welcome’ # Adding Nested Key value to Dictionary Dict[5] = {'Nested' :{'1' : 'Life', '2' : 'Zooming’}}
- 5. Dictionary – Accessing element # Creating a Dictionary Dict = {1: 'Zooming', 'name': 'For', 3: 'Zooming'} # accessing a element using key print("Acessing a element using key:") print(Dict['name']) # accessing a element using key print("Acessing a element using key:") print(Dict[1]) # accessing a element using get() # method print("Acessing a element using get:") print(Dict.get(3))
- 6. Dictionary – Removing element Dict = { 5 : 'Welcome', 6 : 'To', 7 : 'Geeks’, 'A' : {1 : 'Geeks', 2 : 'For', 3 : 'Geeks'}, 'B' : {1 : 'Geeks', 2 : 'Life'}} print("Initial Dictionary: ") print(Dict) # Deleting a Key value del Dict[6] # Deleting a Key from Nested Dictionary del Dict['A'][2] # Deleting a Key using pop() Dict.pop(5) # Deleting entire Dictionary Dict.clear()
- 7. METHODS DESCRIPTION copy() They copy() method returns a shallow copy of the dictionary. clear() The clear() method removes all items from the dictionary. pop() Removes and returns an element from a dictionary having the given key. popitem() Removes the arbitrary key-value pair from the dictionary and returns it as tuple. get() It is a conventional method to access a value for a key. dictionary_name.values() returns a list of all the values available in a given dictionary. str() Produces a printable string representation of a dictionary. update() Adds dictionary dict2’s key-values pairs to dict setdefault() Set dict[key]=default if key is not already in dict keys() Returns list of dictionary dict’s keys items() Returns a list of dict’s (key, value) tuple pairs has_key() Returns true if key in dictionary dict, false otherwise fromkeys() Create a new dictionary with keys from seq and values set to value. type() Returns the type of the passed variable. cmp() Compares elements of both dict.